xstrerror.c revision 33965
11573Srgrimes/* xstrerror.c -- jacket routine for more robust strerror() usage. 21573Srgrimes Fri Jun 16 18:30:00 1995 Pat Rankin <rankin@eql.caltech.edu> 31573Srgrimes This code is in the public domain. */ 41573Srgrimes 51573Srgrimes#include <stdio.h> 61573Srgrimes 71573Srgrimes#include "libiberty.h" 81573Srgrimes#include "config.h" 91573Srgrimes 101573Srgrimes#ifdef VMS 111573Srgrimes#include <errno.h> 121573Srgrimes#if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES) 131573Srgrimesextern char *strerror PARAMS ((int,...)); 141573Srgrimes#define DONT_DECLARE_STRERROR 151573Srgrimes#endif 161573Srgrimes#endif /* VMS */ 171573Srgrimes 181573Srgrimes#ifndef DONT_DECLARE_STRERROR 191573Srgrimesextern char *strerror PARAMS ((int)); 201573Srgrimes#endif 211573Srgrimes 221573Srgrimes/* If strerror returns NULL, we'll format the number into a static buffer. */ 231573Srgrimes 241573Srgrimes#define ERRSTR_FMT "undocumented error #%d" 251573Srgrimesstatic char xstrerror_buf[sizeof ERRSTR_FMT + 20]; 261573Srgrimes 271573Srgrimes/* Like strerror, but result is never a null pointer. */ 281573Srgrimes 291573Srgrimeschar * 301573Srgrimesxstrerror (errnum) 311573Srgrimes int errnum; 321573Srgrimes{ 3390039Sobrien char *errstr; 3490039Sobrien#ifdef VMS 351573Srgrimes char *(*vmslib_strerror) PARAMS ((int,...)); 361573Srgrimes 371573Srgrimes /* Override any possibly-conflicting declaration from system header. */ 381573Srgrimes vmslib_strerror = (char *(*) PARAMS ((int,...))) strerror; 391573Srgrimes /* Second argument matters iff first is EVMSERR, but it's simpler to 401573Srgrimes pass it unconditionally. `vaxc$errno' is declared in <errno.h> 411573Srgrimes and maintained by the run-time library in parallel to `errno'. 421573Srgrimes We assume that `errnum' corresponds to the last value assigned to 431573Srgrimes errno by the run-time library, hence vaxc$errno will be relevant. */ 441573Srgrimes errstr = (*vmslib_strerror) (errnum, vaxc$errno); 451573Srgrimes#else 461573Srgrimes errstr = strerror (errnum); 471573Srgrimes#endif 481573Srgrimes 491573Srgrimes /* If `errnum' is out of range, result might be NULL. We'll fix that. */ 501573Srgrimes if (!errstr) 511573Srgrimes { 521573Srgrimes sprintf (xstrerror_buf, ERRSTR_FMT, errnum); 531573Srgrimes errstr = xstrerror_buf; 541573Srgrimes } 551573Srgrimes return errstr; 561573Srgrimes} 571573Srgrimes